Added ZenDesk module
Add node-zendesk to dependencies
Re-add api import to oae-tickets-zendesk init module

It's required to bind event handlers.
Clarify zendesk URI config documentation

When specifying a zendesk URI the API base path must be included, not just the host.
Tweak zendesk ticket description template

- Email in the ticket is now the address provided in the form
- The acceptance date is included
- The download link for the uploaded file is included
- The funders are formatted as a comma separated list without the other funder
- The other funder (if any) is shown separately
Update oae-tickets-zendesk tests to work with current code